Armature for dynamo-electric machines



('Nollodel.)

W. E. SAWYER 8v E. R. KNOWLES.

Armature for Dynamo Electric Machines.

No. 241,242. Patented May 10,1881.

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UNITED STATES PATENT OFFICE.

WILLIAM E. SAWYER, OF NEYV YORK, AND EDWARD R. KNOWLES, OF

BROOKLYN, N. Y., ASSIGNORS TO EASTERN ELECTRIC MANUFACTUR- ING COMPANY,OF MIDDLETOW'N, CONNECTICUT.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 241,242, dated May 10,1881,

To all whom it may concern Be it known that we, WILLIAM E. SAWYER andEDWARD R. KNoWLEs, citizens of the United States, residing at New Yorkand Brooklyn, in the counties of New York and Kings and State of NewYork, have invented certain new and useful Improvements inDynamo-Electric Machines; and we do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being bad to the accompanying drawings, and to lettersor figures of reference marked thereon, which form a part of thisspecification.

Our invention relates to dynamo-electric machines.

The object ofour invention is to preventheating of the several parts ofthe generator.

The invention consists in an armature-shaft perforated at its ends toadmit water into an annular space formed by an outer and inner cylinder,suitably secured to the armatureshaft, the annular space thus formedbeing larger than the ingress and egress openings in the armature-shaft.

It further consists in details of construction that will be hereinaftermore fully set forth in the accompanying specification, and pointed outin the drawings, in which- Figure l is a vertical section of our device,and Fig. 2 is a cross-section of the same.

It is well known that when a dynamo-electric machine is driven at such arate of speed as to generate the quantity of electricity required theparts of the machine become heated to such a degree as to greatlyincrease the resistance, and often burn the insulating substancesurrounding the wires. Various means have been devised to prevent thiselectrical heating. Some of them consist in passing water directlythrough the shaft. Others consist in having great exposure of surface.These methods are, however, defective, and do not give good results.

(No model.)

In order to overcome these objections we construct the armature of awrought-iron tube, D, to the ends of which are screwed brass disks C C,fixed to a shaft, A.

B is a brass cylinder, closed at both ends and secured to the shaftinside of the iron tube D. The water flows into the shaft at a and allaround the annular space S, between the cylinders B and D, and flows outat b. The ad vantages are that the water entering at one end of theshaft is compelled to flow to the inner surface of the outside cylinder,D, thus keeping it cool, the wires being wound around this cylinder.Moreover, the annular space 8 being large, a large quantity of water canpass through the armature-space. This form of construction of thearmature, by making it of two cylinders, reduces the weight, and hencedoes not require so much power to rotate it; or the cylinder B might beomitted.

Having thus described our invention, what we claim is 1. Adynamo-electric machine the armature of which consists of two cylinderssuit-ably secured to the armature-shaft in such manner as to leave anannular water-space between the cylinders larger than the openingthrough which the water flows into and out of said wa ter-space,substantially as described, and for the purpose set forth.

2. A dynamo-electric machine the armature of which consists of an outerand inner cylin- \VM. E. SAVYER. EDWVARD R. KNOWLES.

Witnesses J OHN F. TAPSCO'lT, LEONARD SAWYER.

